• Title, Summary, Keyword: Multi-input converter

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A Sinusoidal Input Current Multi-Level Converter Using Transformer (변압기를 사용한 정현파 입력전류 Multi-Level Converter)

  • Kim, C.S.;Lee, H.W.;Suh, K.Y.;Chun, J.H.;Han, H.D.;Park, W.H.
    • Proceedings of the KIEE Conference
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    • pp.250-253
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    • 2001
  • This paper is proposed a sinusoidal input voltage Multi-level AC-DC Converter using transformer. In this paper Multi-level PWM Control converter which controls input current by combining buck Converters together to improve input current characteristic, and confirmed its validity throughout simulation and experiment. This method, which is multiplying and duplicating output of converter of equal capacity, is able to control unit power factor of input current, reduce the problem caused by high frequency switching, and apply to high power converter because filter is not necessary.

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Operational Mode Analysis of the AT Flyback Multi-Resonant Converter (AT 플라이백 다중공진형 컨버터 동작모드 해석)

  • Park, Gwi-Cheol;Kim, Chang-Sun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.7
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    • pp.1250-1254
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    • 2007
  • The multi-resonant(MR) converter has a characteristics that the parasitic components existing in the converter are absorbed into the resonant circuits. The designed MR converter could be got a high efficiency and a high power density because the switching power losses are reduced effectively due to resonant switching circuit. However, the high resonant voltage stress of switching power devices leads to the conduction loss. In this paper, it is proposed the novel alternated(AT) flyback multi-resonant converter to overcome such a drawback. The suggested converter dc input is divided by two series input filter capacitors. The resonant stress voltage is reduced to 2-3 times the input voltage without any complexity and it provides the various circuit schemes in lots of applications. The proposed flyback MR converter is verified through simulation and experiment.

The operational characteristics of the AT Forward Multi-Resonant Converter (AT 포워드 다중 공진형 컨버터의 동작 특성)

  • 김창선
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.12 no.3
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    • pp.114-123
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    • 1998
  • The multi-resonant converter(MRC) minimizes a parasitic oscillation by using the resonant tank circuit absorbed parasitic reactances existing in a converter circuit. So it si possible that the converter operated at a high frequency has a high efficiency because the losses are reduced. Such a MHz high frequency applications provide a high power density [W/inch3] of the converter. But the resonant voltage stress across a switch of the resonant tank circuit is 4~5 times a input voltage. This h호 voltage stress increases the conduction loss because of on-resistance of a MOSFET with higher rating. Thus, in this paper we proposed the alternated multi-resonant converter (AT MRC) differ from the clamp mode multi-resonant converter and applicated it to the forward MRC. The AT forward MRC can reduce the voltage stress to 2~3 times a input voltage by using two series input capacitor. The control circuit is simple because tow resonant switches are driven directly by the output pulse of the voltage controled oscillator. This circuit type is verified through the experimental converter with 48V input voltage, 5V/50W output voltage/power and PSpice simulation. the measured maximum voltage stress is 170V of 2.9 times the input voltage and the maximum efficiency of 81.66% is measured.

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The control of Interleaved Multi-phase Boost Converter for Application of a Fuelcell Railway Vehicle (연료전지 철도차량 적용을 위한 인터리브드 다상 승압형 컨버터 제어)

  • Kim, Jae-Moon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.11
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    • pp.1925-1930
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    • 2016
  • Fuel cell power generation system, unlike conventional energy sources, converts chemical energy into electrical energy through electrochemical reaction of hydrogen and oxygen. This paper presents the control of interleaved multi-phase boost converter as the feasibility study on small-scale prototype electric railway vehicle application using fuel cell generation system. PSIM simulation program is to be used to implement the modeling of the electrical fuelcell as well as traction motor control with interleaved multi-phase boost converter. Comparing the input current ripple rate, two-phase interleaved boost converter is less than the boost converter. But the more multi-phase not less proportional to the ripple factor. we confirmed that the amplitude of the input current ripple rate of converter depend on duty ratio.

Single Input Multi Output DC/DC Converter: An Approach to Voltage Balancing in Multilevel Inverter

  • Banaei, M.R.;Nayeri, B.;Salary, E.
    • Journal of Electrical Engineering and Technology
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    • v.9 no.5
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    • pp.1537-1543
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    • 2014
  • This paper presents a new DC/AC multilevel converter. This configuration uses single DC sources. The proposed converter has two stages. The first stage is a DC/DC converter that can produce several DC-links in the output. The DC/DC converter is one type of boost converter and uses single inductor. The second stage is a multilevel inverter with several capacitor links. In this paper, one single input multi output DC-DC converter is used in order to voltage balancing on multilevel converter. In addition, as compare to traditional multilevel inverter, presented DC/AC multilevel converter has less on-state voltage drop and conduction losses. Finally, in order to verify the theoretical issues, simulation and experimental results are presented.

Harmonic Reduction of Three Phase Multi-Pulse Converter Circuit without Input Transformer (입력 변압기 없는 3상 멀티-펄스 콘버터의 고조파 저감)

  • Park, Hyun-Chul;Kim, Yeong-Min;Hwang, Jong-Sun;Kim, Jong-Man
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.128-131
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    • 2002
  • In this paper, a new method for reducing harmonic in input AC line currents of converter presents, which is the multi-pulse converter circuit without the input transformer. This system can reduce the harmonic like conventional 12-pulse converter. Both the bridge circuits are controlled with the shifted firing angle and connected 2 tap inter-phase reactor. Using 2 tap changing on inter-phase reactor, the input current is controlled with the different two values in order to make the input current waveform 12 pulses.

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The Current Control with Multi-level Converter on Transformer type (변압기 방식 멀티레벨 컨버터의 전류제어)

  • Kim C. S.;Kwak D. G.;Chun J. H.;Suh K. Y.;Lee H. W.
    • Proceedings of the KIPE Conference
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    • pp.215-218
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    • 2001
  • This paper is proposed a sinusoidal input current multi-level ac-dc converter using transformer. The multi-level converter which controls input current by combining Buck converter to Improve input current characteristics. This method, which is multiplying and duplicating output of converter of equal capacity, is able to control unit power factor of input current, reduce the problem caused by high frequency switching, and apply to high power converter because filter is not necessary The feasibility of the circuit is verified by computer simulation using PSIM

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A New Soft Switching Dual Input Converter for Renewable Energy Systems

  • Harchegani, Amir Torki;Mahdavi, Mohammad
    • Journal of Power Electronics
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    • v.17 no.5
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    • pp.1127-1136
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    • 2017
  • This paper proposes a new soft switching dual input converter for renewable energy systems. Multi-input converters are produced by combining discrete converters. These converters reduce the number of circuit elements, cost, volume and weight of the converter and provide a constant output power in different weather conditions. Furthermore, soft switching techniques can be applied to increase efficiency. In this paper, a Zero Voltage Transition (ZVT) dual input boost converter is presented. Only one auxiliary circuit is used to provide the soft switching condition for all of the semiconductor elements. The proposed converter, which is simulated by ORCAD software, is theoretically analyzed. To confirm the validity of the theoretical analysis, a prototype of proposed converter was constructed. Simulation and experimental results confirm the theoretical analysis. An efficiency comparison shows a one percent improvement at nominal loads.

Alternated Forward ZVS Multi-Resonant Converter (교번으로 동작하는 포워드 영전압 스위칭 다중 공진형 컨버터)

  • 오덕진;황치면;김창선;김희준
    • Proceedings of the KIPE Conference
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    • pp.1-4
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    • 1998
  • In this paper, we proposed the alternated forward zero voltage switching multi-resonant Converter (AT Forward ZVS MRC). The AT forward ZVS MRC has similar characteristics with clamp mode forward ZVS MRC. So it can reduce the voltage stress to tow or three times a input density [W/inch2]. The proposed converter type is verified through the experimental converter with 48V input voltage, 5V/50W output voltage/power. The measured maximum voltage stress is 170V of 2.9 times the input voltage and the maximum efficiency of 81.66% is measured.

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Novel Flyback ZVS Multi Resonant Converter (새로운 플라이백 영전압 스위칭 다중공진형 컨버터)

  • Kim, Ki-Young;Youn, Dae-Young;Kim, Chang-Sun
    • Proceedings of the KIEE Conference
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    • pp.1065-1066
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    • 2006
  • The multi-resonant converter minimizes the parasitic oscillations using the resonant tank circuit absorbed parasitic reactances in a converter. So the converter can be operated at a high frequency and it provides a high efficiency because the switching power losses are reduced effectively. However, the high resonant voltage stress of semiconductors leads to the conduction loss. In this paper, it is proposed the novel flyback multi-resonant converter. The converter input is divided by two series input capacitors. And also the resonant stress is reduced to 2-3 times input voltage without any complexity and it provides the various circuit schemes in lots of applications. The proposed converters are verified through simulation and experiment.

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